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Genetic Diversity of Small Eukaryotes in Lakes Differing by Their Trophic

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Genetic Diversity of Small Eukaryotes in Lakes Differing by Their Trophic APPLIED AND ENVIRONMENTAL MICROBIOLOGY, Oct. 2005, p. 5935–5942 Vol. 71, No. 10 0099-2240/05/$08.00ϩ0 doi:10.1128/AEM.71.10.5935–5942.2005 Copyright © 2005, American Society for Microbiology. All Rights Reserved. Genetic Diversity of Small Eukaryotes in Lakes Differing by Their Trophic Status Marie Lefranc, Aure´lie The´not, Ce´cile Lepe`re, and Didier Debroas* Universite´ Blaise Pascal, Laboratoire de Biologie des Protistes UMR CNRS 6023, 63177 Aubie`re cedex, France Received 1 December 2004/Accepted 10 May 2005 Small eukaryotes, cells with a diameter of less than 5 ␮m, are fundamental components of lacustrine planktonic systems. In this study, small-eukaryote diversity was determined by sequencing cloned 18S rRNA genes in three libraries from lakes of differing trophic status in the Massif Central, France: the oligotrophic Lake Godivelle, the oligomesotrophic Lake Pavin, and the eutrophic Lake Aydat. This analysis shows that the least diversified library was in the eutrophic lake (12 operational taxonomic units [OTUs]) and the most diversified was in the oligomesotrophic lake (26 OTUs). Certain groups were present in at least two ecosystems, while the others were specific to one lake on the sampling date. Cryptophyta, Chrysophyceae, and the strictly heterotrophic eukaryotes, Ciliophora and fungi, were identified in the three libraries. Among the small eukaryotes found only in two lakes, Choanoflagellida and environmental sequences (LKM11) were not detected in the eutrophic system whereas Cercozoa were confined to the oligomesotrophic and eutrophic lakes. Three OTUs, linked to the Perkinsozoa, were detected only in the Aydat library, where they represented 60% of the clones of the library. Chlorophyta and Haptophyta lineages were represented by a single clone and were present only in Godivelle and Pavin, respectively. Of the 127 clones studied, classical pigmented organisms (autotrophs and mixotrophs) represented only a low proportion regardless of the library’s origin. This study shows that the small-eukaryote community composition may differ as a function of trophic status; certain lineages could be detected only in a single ecosystem. Picoeukaryotes are probably the most abundant eukaryotes genes and have shown high phylogenetic diversity (15, 34, 39). on earth. They are found in all lakes and oceans at densities Moon-van der Staay et al. (39) identified a wide variety of from 102 to 104 cells/ml (8, 32). They constitute essential com- lineages mainly affiliated with photosynthetic classes. They re- ponents of the microbial food web and play significant roles in trieved sequences not clearly assigned to any known organisms. the geochemical cycle (5, 8, 50). The study carried out in deep Antarctic waters by Lo´pez- It is difficult to characterize these organisms by simple ob- Garcı´a et al. (34), under conditions considered inhospitable, servation with optical microscopy, and cultivation methods do showed the presence of many new lineages affiliated with non- not allow all the organisms to grow. Natural assemblages can photosynthetic groups including two new distinct alveolate be studied, without cultivation, by using chromatographic groups, which represented 65 to 76% of the clones analyzed. methods, high-performance liquid chromatography, and gas According to Moon-van der Staay et al. (39), the analysis of chromatography (4, 44). Pigment and/or fatty acid analysis can picoeukaryotic diversity in the surface waters of the Mediter- provide some information on the structure and dynamics of the ranean, North Atlantic, and Antarctic regions demonstrated phototrophic and/or heterotrophic behavior of planktonic or- the presence of many photosynthetic and heterotrophic lin- ganisms, but the phylogenetic information supplied by these eages. A large proportion of clones belonged to novel lineages methods is limited. including, novel stramenopiles and novel alveolates. In the last decade, the introduction of molecular techniques It should be emphasized that these studies on small aquatic into microbial ecology has greatly increased our knowledge by eukaryote diversity were conducted in marine ecosystems. identifying the smallest aquatic microorganisms and, more par- Thus, little is known about the diversity of this planktonic ticularly, prokaryotes. Within Eubacteria at least 13 novel di- community in lake systems, despite the large numbers of pig- visions have been catalogued, and certain clusters, such as mented organisms that participate in primary production (1, SAR11, appear to be significant components of the marine 51) and colorless cells that are generally considered grazers of bacterioplankton (21, 25). Novel archaeal lineages without any known cultured organisms have also been recognized (13, 20). prokaryotic and eukaryotic cells (11). These organisms are able Despite the power of molecular ecology techniques, these to use dissolved organic matter directly through the phagotro- methods have not been as widely used for microeukaryotes as phic process (49). ␮ for prokaryotes. Several recent studies have analyzed the di- In this study the diversity of small eukaryotes (0.2 to 5 m) versity of small eukaryotes (Ͻ3or5␮m), sampled in different was examined by cloning and sequencing eukaryotic rRNA oceanic ecosystems, by gene cloning and sequencing of rRNA genes in three lakes differing by their trophic status (oligotro- phic, oligomesotrophic, and eutrophic). The aim of the study was to determine (i) the structure of small eukaryotes in * Corresponding author. Mailing address: Universite´ Blaise Pascal, lacustrine systems and (ii) whether or not the composition of Laboratoire de Biologie des Protistes UMR CNRS 6023, 63177 Aubie`re cedex, France. Phone: 33 473 407837. Fax: 33 473 4077837. the small eukaryote community is dependent on the system’s E-mail: [email protected]. productivity. As far as we know, this work is the first descrip- 5935 5936 LEFRANC ET AL. APPL.ENVIRON.MICROBIOL. TABLE 1. Main characteristics of the different lakes sampled Chl a Maximum Sampling date Temp Oxygen concn Lake Trophic status Coordinates concn depth (m) (day/mo/yr) (°C) (mg/liter) (␮g/liter) Godivelle Oligotrophic 45°23ЈN, 2°55ЈW 55 17/07/02 14.9 18 0.02 Pavin Oligomesotrophic 45°30ЈN, 2°53ЈW 95 02/07/02 15 9.9 1.9 Aydat Eutrophic 45°39ЈN, 2°59ЈW 15 06/08/02 25.5 7.4 12.2 tion of small-eukaryote diversity in lakes by using molecular electrophoresis in a 2.5% low-melting-point agarose gel (NuSieve) at 60 mV for techniques. about 3 h. Clones from the same library (i.e., lake) that produced the same RFLP pattern were grouped together and considered members of the same operational taxonomic unit (OTU). Thereafter, the OTUs from the three libraries were MATERIALS AND METHODS checked by terminal RFLP (T-RFLP) analysis. 18S rRNA genes from clones were amplified as described above, except that the fluorescently labeled forward Study site and sampling. The study was conducted in three lakes (Massif primer 1f-FAM (6-carboxyfluorescein) (labeled at the 5Ј end with fluorescent Central, France): the oligotrophic Lake Godivelle (lac d’en haut), the oligome- sequencing dye [MWG Biotech, Germany]) was used. PCR products were puri- sotrophic Lake Pavin, and the eutrophic Lake Aydat (Table 1). The circular Lake fied using the Qiaquick PCR purification kit (QIAGEN), visualized on 1% Godivelle, situated at an altitude of 1,239 m with a maximum depth of 44 m, agarose gels, and quantified (DNA quantification kit; Sigma). Enzymatic diges- occupies a volcanic explosion crater. Lake Pavin, situated at an altitude of 1,197 tions were performed separately for each restriction enzyme used by incubating m, is a typical crater mountain lake with a maximum depth of 92 m. Aydat Lake 100 ng of PCR products with 20 U of MspI and RsaI (Sigma) at 37°C overnight. was formed when a lava flow dammed the small river Veyre. It is a dimictic lake The samples were desalted with Microcon columns (Amicon; Millipore). The with a maximum depth of 15 m, situated at an altitude of 825 m (46). Mean terminal restriction fragments (T-RFs) were separated on an automated se- chlorophyll a (Chl a) concentrations were Ͻ1, 2, and 12 ␮g/liter in Godivelle, quencer (ABI 3700), and T-RF sizes were determined using Genescan analytical Pavin and Aydat lakes, respectively. Average total phosphorus concentrations (in software. micrograms of P per liter) were 4 in Lake Godivelle, 10 in Lake Pavin, and 35 in At least one clone of each OTU was selected for sequencing. Double-stranded Lake Aydat (46). The temperatures and dissolved oxygen and Chl a concentra- plasmid DNAs from selected clones were extracted with a QIAprep Spin Mini- tions measured at the sampling date (summer 2002) are reported in Table 1. prep kit (QIAGEN). Euk-1F and an internal primer (Ek-555f [AGTCTGGTG One sample per lake was collected in the euphotic zone with a Van Dorn CCAGCAGCCGC] or Ek-NSF573 [CGCGGTAATTCCAGCTCCA]) were used bottle at the deepest point in the three lakes. Water samples (from 70 to 120 ml for partial sequencing, and a vector primer and an internal primer were used for depending on the lake) were prefiltered through 5-␮m-pore-size polycarbonate complete sequencing. Nineteen OTUs were totally sequenced. Sequencing reactions prefilters (Millipore) at a very low vacuum to prevent cell damage (pressure, Ͻ2 were performed by MWG (http//www.mwg-biotech.com). kPa) and kept in 150-ml plastic bottles for less than 2 h during transport until Phylogenetic analysis. To determine the first phylogenetic affiliation, each processing in the laboratory for microbial collection. The microbial biomass was sequence was compared with sequences available in databases using BLAST collected on 0.2-␮m-pore-size (pressure, Ͻ10 kPa) polycarbonate filters (Milli- from the National Center for Biotechnology Information and the Ribosomal pore) and stored at Ϫ80°C until nucleic acid was extracted. Database Project (2, 37). The sequences were aligned with complete sequences Nucleic acid extraction. The filters were covered with TE buffer (1ϫ Tris and Ϫ of an ARB database using the latter’s automatic alignment tool (www.arb- EDTA) and a lysosyme solution (final concentration, 250 ␮g·ml 1) and were home.de) (36).
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